Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
Drill bit










Image Number 2 for United States Patent #6637987.

A drill bit capable of axial cutting as well as side cutting, having a generally cylindrical elongate body with a bit diameter, includes a frontmost drilling end for axial cutting, a cutting section extending from the drilling end for side cutting, and a shank extending from the cutting section. The cutting section is helically cut at a helix angle of substantially 15.degree..+-.2.degree. to form one pair of diametrically opposite helical flutes whose outermost edges are sharpened to form respective cutting edges, arranged around a solid central core whose diameter is substantially directly proportional to the bit diameter. The length of the cutting edges in the axial direction of the drill bit body is calculated according to the formula: Cutting Edge=Bit Diameter.times..pi..times.C.sub.c /Tan (Helix Angle), C.sub.c being a constant in a range from 0.85 to 0.90.








 
 
  Recently Added Patents
Contact sensor, driver device, and care bed
Dihydronaphthyridinyl(organo)methanone analogs as positive allosteric mGluR5 modulators
Sponge
Warm air generating apparatus, sheet feeding apparatus, and image forming apparatus including warm air generating apparatus and sheet feeding apparatus
Methods for integrating the production of cellulose nanofibrils with the production of cellulose nanocrystals
Translation system adapted for query translation via a reranking framework
Removable storage device and method for identifying drive letter of the removable storage device
  Randomly Featured Patents
Process for extruding crystalline aluminosilicates
DC power supply with reduced ripple
Document management system, document management method, and recording medium storing program for document management
Medicated comb for dandruff and other hair and scalp diseases
Cage for small climbing animals and reptiles
Adjustable pot supporting device
Tree collar planter
Overall risk in a system
Impact wrench
Component and turbine assembly with film cooling